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Standard XII

Chemistry

Hardness of Water and Treatment

Assertion :Te...

Question

Assertion :Temporary hardness can be removed by addition of lime. Reason: $C a (H C O_{3})_{2}$ in hard water is converted to insoluble $C a C O_{3}$ on moderate heating.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Temporary hardness can be reduced either by boiling the water, or by the addition of lime (calcium hydroxide) through the softening process of lime softening.

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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

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Assertion :Temporary hardness can be removed by addition of lime. Reason: Ca(HCO3)2 in hard water is converted to insoluble CaCO3 on moderate heating.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionTemporary hardness can be reduced either by boiling the water, or by the addition of lime (calcium hydroxide) through the softening process of lime softening.

Assertion :Temporary hardness can be removed by addition of lime. Reason: $C a (H C O_{3})_{2}$ in hard water is converted to insoluble $C a C O_{3}$ on moderate heating.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Temporary hardness can be reduced either by boiling the water, or by the addition of lime (calcium hydroxide) through the softening process of lime softening.